<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
    <style>
        body {
            margin: 0;
        }


        ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: #333;
            position: fixed;
            /* 固定在底部 */
            bottom: 0;
            width: 100%;
        }

        li {
            float: left;
        }

        li a {
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
        }

        li a:hover:not(.active) {
            background-color: #111;
        }

        .active {
            background-color: #4CAF50;
        }

        /* 注意: 该实例可以在移动设备上使用。 */
    </style>
</head>

<body>

    <ul>
        <li><a class="active" href="#home">主页</a></li>
        <li><a href="#news">新闻</a></li>
        <li><a href="#contact">联系</a></li>
        <li><a href="#about">关于</a></li>
    </ul>

    <div style="padding:20px;background-color:#1abc9c;height:1500px;">
        <h1>Fixed Bottom Navigation Bar</h1>
        <h2>Scroll this page to see the effect</h2>
        <h2>The navigation bar will stay at the bottom of the page while scrolling</h2>

        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
        <p>Some text some text some text some text..</p>
    </div>

</body>

</html>